Font::TTF::GDEF(3)

NAME
Font::TTF::GDEF - Opentype GDEF table support

DESCRIPTION
The GDEF table contains various global lists of information which are apparantly used in other places in an OpenType renderer. But precisely where is open to speculation...

INSTANCE VARIABLES
There are up to 5 tables in the GDEF table, each with their own structure:

GLYPH
    This is an Font::TTF::Coverage Class Definition table containing information as to what type each glyph is.

ATTACH
    The attach table consists of a coverage table and then attachment points for each glyph in the coverage table:

    COVERAGE
        This is a coverage table

    POINTS
        This is an array of point elements. Each element is an array of curve points corresponding to the attachment points on that glyph. The order of the curve points in the array corresponds to the attachment point number specified in the MARKS coverage table (see below).

LIG This contains the ligature caret positioning information for ligature glyphs

    COVERAGE
        A coverage table to say which glyphs are ligatures

    LIGS
        An array of elements for each ligature. Each element is an array of information for each caret position in the ligature (there being number of components - 1 of these, generally)

        FMT This is the format of the information and is important to provide the semantics for the value. This value must be set correctly before output

        VAL The value which has meaning according to FMT

        DEVICE
            For FMT = 3, a device table is also referenced which is stored here

MARKS
    This class definition table defines the classes of mark glyphs that can be selected for processing using the MarkAttachmentType field of lookup FLAG words.

MARKSETS
    Contains an array of coverage tables indexed by the FILTER value of a lookup.

METHODS

  $t->read
Reads the table into the data structure

  $t->out($fh)
Writes out this table.

  $t->minsize()
Returns the minimum size this table can be. If it is smaller than this, then the table must be bad and should be deleted or whatever.

  $t->update
Sort COVERAGE tables.

AUTHOR
Martin Hosken <http://scripts.sil.org/FontUtils>.

LICENSING
Copyright (c) 1998-2016, SIL International (http://www.sil.org)

This module is released under the terms of the Artistic License 2.0. For details, see the full text of the license in the file LICENSE.